Hi All!!

I left out too much as to what the situation is and the reasons.

To make a long "story" short(er) we need a protocol to estimate effective
permeability over an area of roughly 4 acres that is proposed for spray
irrigation of treated sewage effluent.

The situation is that active roots extend though the fill & have developed
weak structure within the fill - it is unsure if the effective permeability
is greater than 0.2 - or significantly less. Which would make quite a
difference as to required acreage for spray irrigation of pretreated
effluent.

What we have to do to "measure" the effective permeability of materials
below the 4.5' depths We will have pits excavated to
at least the 4 feet deep then install and run "perk test" procedures
within the excavations - below the 4.5 foot "soil" depths.

Active roots have developed as deep as 5' and the roots have helped to
develop soil structure but the roots are random. Therefore
we feel taht tests will have to cover a wider area than typical for a
standard falling perk procedure - perhaps a trench version of the falling
head procedure?

We suspicion that 2 or 3 trench tests (one within each 4.5' deep pit) would
be more practical and representative than 8 to 12 individual perk holes -
not to mention the effort involved.

Perhaps the trenches would be about: 3' long, 1' wide and 1' deep and the
trenches would be excavated by hand.

We thought some of you might be familiar with such an already developed
"trench " procedure - or any suggestions.

Thanking you in advance.

Jim & Dan.


>> We are seeking your input and assistance concerning estimating
>> effective permeability of fill materials.
>>
>>To make a long "story" short(er) we are seeking an established protocol to
>>estimate effective permeability over a wider area than typical for a
>>standard falling perk. procedure - perhaps a trench version of the falling
>>head procedure?
>>
>>We thought you might be familiar with such an already developed "trench "
>>procedure - or you might have developed one for use with characterization
>>of fill materials.
>>
>>The situation is that active roots extend though the fill & have developed
>>weak structure within the fill - it is unsure if the effective
>>permeability is greater than 0.2 - or significantly less. Which would
>>make quite a difference as to required acreage for spray irrigation of
>>pretreated effluent.
>>
>>What we have to do is have pits excavated 4 feet deep then install and
>>run "perch test" procedures within the excavations - below the 5 foot
>>"soil" depths.
>>
>>We feel that 2 or 3 trench tests would be more practical and
>>representative than 8 to 12 individual perk holes - not to mention
>>effort..
>>
>>Thanking you in advance.
>>
>>Jim & Dan
>>
>>Voice: 330-499-1688
>>
>>Fax: 330-499-1127
>>
>>.
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